Github user MLnick commented on the issue:

    https://github.com/apache/spark/pull/18513
  
    I've moved `HashingTF` `numFeatures` param to `sharedParams` which results 
in the MiMa failure since it would now be marked `final`. Can't quite recall 
what we've done previously in this case - whether we accept that it breaks user 
code, but that in most cases users should not have really been extending or 
overriding these params. Or leave it as is.
    
    I'm ok with the latter - `numFeatures` is not really that necessary to be a 
shared param. 


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